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A traditional introduction to any programing language is to show how it would output the phrase Hello World!” In Ruby, a hello world program comprises merely one line:

puts "Hello World!"

which would output to a terminal window:

Hello World!

The word “puts” tells Ruby to print whatever is contained to the right of the word to the terminal screen. Since “Hello World!” is a string (text characters), it must be encased in quote marks (regular quotes i.e. “, not smart quotes, i.e. ”).

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